code: def __str__(self):
      if self.pred:
          items = [
              f"{op}{'.'.join(map(str, ver))}" for op, ver in self.pred
          ]
          return f"{self.name}({','.join(items)})"
      else:
          return self.name
  
file_path: mpi4py/test/mpiunittest.py
imports: from collections import namedtuple
  import contextlib
  import unittest
label_desc: Use image node_id 2 for calling the _VersionPredicate obj's underlying member method code with example usage: obj.__str__() and returns: self, str, str, str, self